New Techniques for Studies of Nuclear Spin Relaxation and Molecular Dynamics in Solids

固体核自旋弛豫和分子动力学研究新技术

• 批准号: 9000427
• 负责人: Regitze Vold
• 金额: $ 60.34万
• 依托单位: University of California-San Diego
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-04-01 至 1993-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9000427&HistoricalAwards=false
• 关键词: New; Techniques; Studies; Nuclear; Spin

Professors Regitze and Robert Vold have been awarded a grant from the Experimental Physical Chemistry Program for research using very large magnetic fields to study the structure of solids and "ordered" liquids. This work will allow us to better understand the underlying principles of the structure and dynamics of condensed matter. This project focuses on several topics of current interest e.g. the mechanism of alkyl chain motion in channel clathrates,in layered intercalation compounds and alkylated clusters; the effects of specific interactions such as hydrogen bonding on internal rotations in molecular crystals; and the molecular reorientation in liquid crystals. Advantage will be taken of recently developed techniques for comparing the individual spectral densities of motion obtained from experiments with those obtained from molecular dynamics calculations. Particular advantage will be taken of a new magnetic resonance technique developed by the Volds called frequency stepping in order to greatly reduce the usual line broadening problems associated with isotopes whose nuclear spin average is greater than one half.

Regitze教授和Robert Vold教授获得了实验物理化学项目的资助，用于研究使用超大磁场来研究固体和“有序”液体的结构。这项工作将使我们能够更好地理解凝聚态物质的结构和动力学的基本原理。该项目集中于当前感兴趣的几个主题，例如通道笼形物中烷基链运动的机制，层状插层化合物和烷基化簇；氢键等特定相互作用对分子晶体内旋的影响；以及液晶中的分子重定向。将利用最近发展的技术来比较从实验中获得的单个运动谱密度与从分子动力学计算中获得的运动谱密度。沃尔德人开发的一种叫做频率步进的新磁共振技术将具有特别的优势，以大大减少与核自旋平均值大于1 / 2的同位素相关的通常的线拓宽问题。